Move all the OS-specific path PREFIX settings into LuminaOS so that we don't have all the different defines all over the place.
Merge branch 'master' of github.com:pcbsd/lumina

Conflicts:
	libLumina/LuminaXDG.cpp
Also fix the PREFIX settings for the new dragonfly OS file.
Update lumina-desktop to use the new LuminaOS shortcuts/prefix settings.
Update lumina-config to use the new OS prefix settings.